What is the difference between PowerPDU 4C and 4PS?

The 4PS model is simpler. It is intended for basic applications that require remote switching of power outputs.

PowerPDU 4PS does not support electrical measurements, RS-232 or Lua scripts. PowerPDU 4PS does not have buttons for direct control of the power outputs, and only has one RJ45 jack to connect to a LAN.